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Water wheels were often used to power heavy equipment like mills. Water from a river would be diverted from upstream to flow onto the top of the wheel, with the weight of the water turning the wheel.

If a 3.25-m high water wheel is generating 31.8 Watt of power (1 W = 1 J/s), what is the mass flow rate of the water entering the top of the wheel?

By The original uploader was DanMS at English Wikipedia(Original text: Daniel M. Short) - Transferred from en.wikipedia to Commons.(Original text: Original artwork by Daniel M. Short), CC BY-SA 2.5,

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